@hai046
2016-08-12T06:49:48.000000Z
字数 3243
阅读 798
算法
具体说明在https://zhuanlan.zhihu.com/p/20533434?refer=gongwenjia
分析如下:
的曲线图如下
的含义是可以解释如下:
好友i和u的加好友的时间 乘以 好友i和加好友的时间 结果 -0.3次方
按照解释 -0.3是Facebook观察分析后的取值

如果1星期不活跃, 就不跑数据 进入后立刻给他跑
| 曝光数 | 衰减比率 |
|---|---|
| 0 | 1 |
| 1 | 0.9956015420051881 |
| 2 | 0.9911911221045455 |
| 3 | 0.9867686382520459 |
| 4 | 0.9823339868842668 |
| 5 | 0.9778870628878733 |
| 6 | 0.9734277595661852 |
| 7 | 0.9689559686047977 |
| 8 | 0.9644715800362211 |
| 9 | 0.9599744822035059 |
| 10 | 0.9554645617228155 |
| 11 | 0.9509417034449101 |
| 12 | 0.946405790415502 |
| 13 | 0.94185670383444 |
| 14 | 0.9372943230136825 |
| 15 | 0.9327185253340116 |
| 16 | 0.9281291862004425 |
| 17 | 0.9235261789962812 |
| 18 | 0.9189093750357756 |
| 19 | 0.9142786435153101 |
| 20 | 0.9096338514630854 |
| 21 | 0.9049748636872269 |
| 22 | 0.9003015427222586 |
| 23 | 0.8956137487738807 |
| 24 | 0.890911339661982 |
| 25 | 0.8861941707618182 |
| 26 | 0.8814620949432812 |
| 27 | 0.8767149625081844 |
| 28 | 0.8719526211254808 |
| 29 | 0.8671749157643314 |
| 30 | 0.8623816886249325 |
| 31 | 0.8575727790670113 |
| 32 | 0.8527480235358895 |
| 33 | 0.8479072554860129 |
| 34 | 0.8430503053018387 |
| 35 | 0.8381770002159669 |
| 36 | 0.8332871642243956 |
| 37 | 0.828380617998775 |
| 38 | 0.8234571787955268 |
| 39 | 0.8185166603616897 |
| 40 | 0.8135588728373446 |
| 41 | 0.808583622654464 |
| 42 | 0.8035907124320214 |
| 43 | 0.7985799408671899 |
| 44 | 0.7935511026224468 |
| 45 | 0.7885039882083931 |
| 46 | 0.7834383838620834 |
| 47 | 0.7783540714206533 |
| 48 | 0.7732508281900161 |
| 49 | 0.7681284268083902 |
| 50 | 0.7629866351044013 |
| 51 | 0.7578252159494916 |
| 52 | 0.7526439271043502 |
| 53 | 0.7474425210590625 |
| 54 | 0.7422207448666576 |
| 55 | 0.7369783399697126 |
| 56 | 0.731715042019654 |
| 57 | 0.7264305806883682 |
| 58 | 0.7211246794717169 |
| 59 | 0.7157970554845172 |
| 60 | 0.7104474192465287 |
| 61 | 0.7050754744589485 |
| 62 | 0.6996809177708933 |
| 63 | 0.6942634385353028 |
| 64 | 0.6888227185536692 |
| 65 | 0.6833584318089483 |
| 66 | 0.6778702441859725 |
| 67 | 0.6723578131786301 |
| 68 | 0.6668207875830281 |
| 69 | 0.6612588071757992 |
| 70 | 0.6556715023766512 |
| 71 | 0.650058493894193 |
| 72 | 0.6444193923539988 |
| 73 | 0.6387537979077942 |
| 74 | 0.6330612998225637 |
| 75 | 0.627341476048287 |
| 76 | 0.6215938927629104 |
| 77 | 0.6158181038930489 |
| 78 | 0.6100136506087974 |
| 79 | 0.6041800607908953 |
| 80 | 0.5983168484683461 |
| 81 | 0.5924235132244364 |
| 82 | 0.5864995395689246 |
| 83 | 0.5805443962739802 |
| 84 | 0.5745575356712449 |
| 85 | 0.568538392907155 |
| 86 | 0.5624863851534121 |
| 87 | 0.5564009107692042 |
| 88 | 0.5502813484114722 |
| 89 | 0.544127056089167 |
| 90 | 0.537937370157062 |
| 91 | 0.5317116042442602 |
| 92 | 0.5254490481120574 |
| 93 | 0.5191489664352983 |
| 94 | 0.5128105975007675 |
| 95 | 0.5064331518154989 |
| 96 | 0.5000158106171416 |
| 97 | 0.49355772427769284 |
| 98 | 0.48705801059096326 |
| 99 | 0.48051575293309 |
| 100 | 0.4739299982842123 |
| 101 | 0.467299755098073 |
| 102 | 0.46062399100477414 |
| 103 | 0.4539016303301642 |
| 104 | 0.4471315514133441 |
| 105 | 0.44031258370149884 |
| 106 | 0.4334435045986509 |
| 107 | 0.4265230360419284 |
| 108 | 0.41954984077548463 |
| 109 | 0.4125225182882031 |
| 110 | 0.40543960037669147 |
| 111 | 0.3982995462896728 |
| 112 | 0.39110073740359375 |
| 113 | 0.3838414713719037 |
| 114 | 0.3765199556818018 |
| 115 | 0.36913430054203983 |
| 116 | 0.361682511013277 |
| 117 | 0.3541624782781008 |
| 118 | 0.34657196993065614 |
| 119 | 0.3389086191452097 |
| 120 | 0.3311699125581287 |
| 121 | 0.3233531766676304 |
| 122 | 0.3154555625189539 |
| 123 | 0.3074740283976236 |
| 124 | 0.29940532019800076 |
| 125 | 0.2912459490654798 |
| 126 | 0.28299216582465647 |
| 127 | 0.2746399315974961 |
| 128 | 0.266184883878122 |
| 129 | 0.2576222971550259 |
| 130 | 0.24894703694449605 |
| 131 | 0.24015350580308575 |
| 132 | 0.23123557949696613 |
| 133 | 0.22218653098626132 |
| 134 | 0.2129989391810959 |
| 135 | 0.20366457846668576 |
| 136 | 0.19417428366273448 |
| 137 | 0.18451778320225046 |
| 138 | 0.17468349061240765 |
| 139 | 0.16465824041589203 |
| 140 | 0.15442694862231562 |
| 141 | 0.1439721688192492 |
| 142 | 0.13327350034758007 |
| 143 | 0.12230678122205299 |
| 144 | 0.11104295781116355 |
| 145 | 0.09944645063648871 |
| 146 | 0.08747269831061942 |
| 147 | 0.07506428354618187 |
| 148 | 0.06214443110324013 |
| 149 | 0.048605148559088866 |
| 150 | 0.034282885522686234 |